Flask how to redirect @login_required to specific route?

(venv)$ pip3 install flask-login && pip3 freeze > requirements.txt
from flask import Flask

app = Flask(__name__)

if __name__ == '__main__':
# __init__.py

from flask import Flask
from flask_login import LoginManager

app = Flask(__name__)

login = LoginManager(app)
login.login_view = 'login'

from app import routes
from app import app
from flask_login import login_required

def index():
    return render_template('index.html')

@app.route('/login', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('index'))
    form = LoginForm()
    if form.validate_on_submit():
        # Your code
    return render_template('login.html', form=form)